Tabbing through forms on laptops?!?!

This might sound like a stupid question but, has anyone had any problems with tabbing through forms on laptop computers? I was testing out a form throughout our office and it works fine on all of the desktop computers as far as being able to tab through the form fields in order. On the laptops though, after the first field, it tabs up to the address bar in the browser. At first I thought it was an XP thing, but when I tested it on one of the desktops running XP it worked fine. All were the same version of IE 6.0.

I was just wondering if anyone else has noticed anything like this. Thanks.